Mp3RandomRenamer.java

package zendo.playground.utils;

import java.io.File;
import java.io.FilenameFilter;
import java.util.*;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Randomly renames MP3 files using {@link UUID} as source for names.
 * 
 * @author mocanu
 */
public class Mp3RandomRenamer {
    private static Log log = LogFactory.getLog( Mp3RandomRenamer.class );

    private static final String TARGET_FOLDER = "G:/ACME Files/Nunta/CD Muzica";

    private static List<Integer> generatedNumbers = new ArrayList<Integer>();

    private static Random randomNumberGenerator = new Random();

    public static void main( String[] args ) {
        File targetFolder = new File( TARGET_FOLDER );
        if ( !targetFolder.exists() ) {
            log.error( "Cannot find the TARGET_FOLDER=" + TARGET_FOLDER );
            System.exit( 1 );
        }

        File[] fileArray = targetFolder.listFiles( new FilenameFilter() {
            @Override
            public boolean accept( File dir, String name ) {
                return (name.toUpperCase().endsWith( "MP3" ));
            }
        } );

        for ( File file : fileArray ) {
            log.info( "Processing " + file.getAbsolutePath() );
            String newFileName = TARGET_FOLDER + "/" + generateNewRandomNumber( fileArray.length ) + "- "
                                 + file.getName();
            log.info( "New file name: " + newFileName );

            if ( !file.renameTo( new File( newFileName ) ) ) {
                log.error( "Failed renaming file " + file.getAbsolutePath() );
            }
        }

        log.info( "Done!" );
    }

    private static int generateNewRandomNumber( int nrOfTotalFiles ) {
        int randomNumber = 0;
        do {
            randomNumber = randomNumberGenerator.nextInt( nrOfTotalFiles ) + 1;
        } while ( generatedNumbers.contains( randomNumber ) );

        generatedNumbers.add( randomNumber );
        return randomNumber;
    }

    // private static String generateNewRandomName() {
    // String uuidStr = UUID.randomUUID().toString();
    // return uuidStr.replaceAll( "-", "" );
    // }

}